After Emily Harrison tells Danny and Baez she's concerned her abusive ex-boyfriend will repeat his behavior with his new girlfriend, Emily becomes the prime suspect when he's murdered. Also, Eddie gets jealous when Jamie lets a young woman crash at his apartment, and Frank must decide how to discipline a sergeant after he fails to intercede during an armed robbery while off duty.

When the son of Frank's most outspoken critic in the African-American community, Reverend Darnell Potter, is killed, Potter must put aside his contentious relationship with the Reagan family in order to get justice for his son. Also, Erin and Anthony investigate when a convicted felon's cause of death is inconsistent with injuries he sustained during a prisoner transport van accident, and Jamie learns that a mugger he shot in self-defense is the son of an NYPD officer.